Finding the Fourth Proportional to 99,817.92, 137,748.72 and 57,384.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,817.92 : 137,748.72 = 57,384.72 : x
2. Step 2: Convert to fraction form
   99,817.92/137,748.72 = 57,384.72/x
3. Step 3: Cross multiply
   99,817.92x = 137,748.72 × 57,384.72
4. Step 4: Simplify right side
   99,817.92x = 7,904,671,727.56
5. Step 5: Solve for x
   x = 7,904,671,727.56/99,817.92
6. Step 6: Final answer
   x = 79,190.91